All of the uses of <region/> in the test suite appear to be invalid as they
omit the <layout/> container element. Following is the general structure for
<head/>:
<head>
( <metadata/> | <ttm:*> )*
( <styling> ( <style/> )* </styling> )?
( <layout> ( <region/> )* </layout> )?
</head>
also, <region/> may have <style/> children